No paper or cloth mask on the market will work... period.
But, you know what will:
An NBC-77 SOF 40mm gas mask filter canister, in combination with a full-face mask, mouthpiece assembly, or PAPR, will reliably protect air passages against a wide range of harmful and highly toxic substances including all known CBRN agents.
Hmmm... They’re so worried about protection and all, but nobody is wearing actually protective equipment are they?
LOL. That just took me back to MOPP training.